High-pressure anti-flutter one-way valve

Abstract

The invention relates to a high-pressure anti-flutter one-way valve which comprises a shell, a valve seat, a valve element framework, a valve element spring and a damping pad. The right end of the shell is provided with a containing cavity, and the left end is provided with an air inlet channel. The left end of the valve core framework is provided with a damping cavity for mounting a damping pad, and the right end is provided with a main spring cavity for mounting a valve core spring; the valve element framework is inserted into the containing cavity, the left end face of the valve element framework makes contact with the inner end face of the containing cavity, the left end face of the damping pad makes contact with and extrudes the inner end face of the containing cavity, the outer circumferential face of the right section of the valve element framework makes contact with the inner side face of the containing cavity, and a gap is formed between the outer circumferential face of the left section of the valve element framework and the inner side face of the containing cavity. A valve element air hole penetrating to the converging cavity is formed in the peripheral surface of the left section of the valve element, and the converging cavity is communicated with the main spring cavity; an installation cavity is formed in the left end of the valve seat, an air outlet channel is formed in the right end of the valve seat, the right section of the shell is inserted and fixed into the installation cavity, and the right end face of the valve element spring makes contact with and extrudes the inner end face of the installation cavity. The check valve can be prevented from fluttering.

Description

Technical Field

[0001] This application relates to the field of aerospace technology, and in particular to a high-pressure anti-flutter check valve. Background Technology

[0002] One-way valves are crucial components of liquid rocket pressurization and delivery systems, typically used in high-pressure cylinder filling circuits, ejector gas supply circuits, tank ground pressurization circuits, gas seal gas supply circuits, and propellant supply circuits. When the pressurization and delivery system operates at low flow rates, the low pressure difference between the inlet and outlet of the one-way valve makes it more prone to flutter problems.

[0003] In the past, there have been several instances of gas leaks caused by the failure of the valve core seal in one-way valves, which significantly impacted rocket testing and launch procedures. Research on the faulty one-way valves revealed that the main cause of valve core seal failure was: during operation, valve core flutter caused damage to the contact area between the valve core and the metal spring seal ring. Accumulated damage led to scratches on the guide surface of the valve core-housing moving pair, ultimately resulting in obstructed valve core return and seal failure.

[0004] Currently, several structural improvements have been made to address the chattering problem in check valves. These include adding a flow-limiting orifice to the valve core and increasing damping with a corrugated belt expansion ring. These methods can suppress chattering to some extent. However, adding a flow-limiting orifice to the valve core reduces the flow coefficient of the check valve. In high-pressure applications, the check valve is relatively large, and using a corrugated belt expansion ring makes installation difficult and prone to jamming.

[0005] Therefore, how to avoid chattering in check valves, ensure that check valves are small in size when used in high-pressure environments, and make check valves easy to install and avoid jamming are technical problems that urgently need to be solved by those skilled in the art. Summary of the Invention

[0006] This application provides a high-pressure anti-chatter check valve, which is suitable for high-pressure, high-flow and low-flow environments. During operation, it can avoid chattering and improve the working performance and reliability of the check valve.

[0007] To solve the above-mentioned technical problems, this application provides the following technical solution:

[0008] A high-pressure anti-flutter one-way valve includes: a housing, a valve seat, a valve core skeleton, a valve core spring, and a damping pad; the right end of the housing has a left-recessed receiving cavity, and the left end of the housing has an air inlet channel extending into the receiving cavity; the left end of the valve core skeleton has a right-recessed damping cavity for mounting the damping pad, and the right end of the valve core skeleton has a left-recessed main spring cavity for mounting the valve core spring; the valve core skeleton is inserted into the receiving cavity, with the left end face of the valve core skeleton contacting the inner end face of the receiving cavity, and the left end face of the damping pad contacting and pressing against the inner end face of the receiving cavity. The outer peripheral surface of the right section of the valve core skeleton contacts the inner surface of the receiving cavity, and there is a gap between the outer peripheral surface of the left section of the valve core skeleton and the inner surface of the receiving cavity. The outer peripheral surface of the left section of the valve core skeleton has a valve core air hole that extends to the merging cavity. The right end of the merging cavity is connected to the left end of the main spring cavity. The left end of the valve seat has a rightward recessed mounting cavity, and the right end of the valve body has an air outlet channel that extends to the mounting cavity. The right section of the housing is inserted into and fixed in the mounting cavity of the valve seat, and the right end face of the valve core spring contacts and presses against the inner end face of the mounting cavity.

[0009] In the high-pressure anti-flutter check valve described above, preferably, the outer peripheral surface of the right section of the housing has an external thread, the inner surface of the mounting cavity has an internal thread, and the right section of the housing is threadedly fixed to the mounting cavity of the valve seat.

[0010] In the high-pressure anti-flutter check valve described above, preferably, the inner end face of the mounting cavity of the valve seat has a spring seat protruding to the left, and the mounting seat surrounds the air outlet passage, with the right end of the valve core spring sleeved on the outside of the spring seat.

[0011] In the high-pressure anti-flutter check valve described above, preferably, a sealing gasket is provided between the right end face of the housing and the inner end face of the mounting cavity, and the sealing gasket is squeezed by the right end face of the housing and the inner end face of the mounting cavity.

[0012] In the high-pressure anti-flutter check valve described above, preferably, the portion of the right end face of the housing near the outer ring is recessed to the left, and the portion of the right end face of the housing near the inner ring is convex to the right; the portion of the inner end face of the mounting cavity near the outer ring is convex to the left, and the portion of the inner end face of the mounting cavity near the inner ring is recessed to the right; the portion of the right end face of the housing that is convex to the right is opposite to the portion of the inner end face of the mounting cavity that is recessed to the right, and the portion of the right end face of the housing that is recessed to the left is opposite to the portion of the inner end face of the mounting cavity that is convex to the left; the sealing gasket is pressed between the portion of the right end face of the housing that is recessed to the left and the portion of the inner end face of the mounting cavity that is convex to the left.

[0013] In the high-pressure anti-flutter check valve described above, preferably, a U-shaped spring is provided between the outer peripheral surface of the right section of the valve core frame and the inner surface of the receiving cavity, and the two spring arms of the U-shaped spring are pressed between the outer peripheral surface of the right section of the valve core frame and the inner surface of the receiving cavity.

[0014] In the high-pressure anti-flutter check valve described above, preferably, the outer peripheral surface of the right section of the valve core skeleton near the left side has an inwardly recessed first valve core groove, and the inner side of the receiving cavity has an outwardly recessed first housing groove at the position corresponding to the first valve core groove. One spring arm of the first U-shaped spring is located in the first valve core groove, and the other spring arm of the first U-shaped spring is located in the first housing groove. The outer peripheral surface of the right section of the valve core skeleton near the right side has an inwardly recessed second valve core groove, and the inner side of the receiving cavity has an outwardly recessed second housing groove at the position corresponding to the second valve core groove. One spring arm of the second U-shaped spring is located in the second valve core groove, and the other spring arm of the second U-shaped spring is located in the second housing groove.

[0015] In the high-pressure anti-flutter check valve described above, preferably, the opening of the first U-shaped spring faces to the left and the opening of the second U-shaped spring faces to the right.

[0016] In the high-pressure anti-flutter check valve described above, preferably, the outer peripheral surface of the left section of the valve core skeleton has multiple valve core vents, and all valve core vents are evenly distributed.

[0017] In the high-pressure anti-flutter check valve described above, preferably, the valve core vent gradually tilts to the right from its inlet to its outlet.

[0018] Compared to the aforementioned background technology, the high-pressure anti-chatter check valve in this application provides damping force to the valve core skeleton 30 during gas release through the damping pad 50, allowing the valve core skeleton 30 to return to its position smoothly and preventing chattering. Furthermore, this application avoids preventing chattering by adding a flow-limiting orifice, thus ensuring that the check valve has a small size when used in high-pressure environments. It also avoids using a corrugated belt expansion ring to prevent chattering, making the installation of the check valve simpler and preventing jamming. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0020] Figure 1 This is a schematic diagram of the high-pressure anti-flutter check valve provided in the embodiments of this application. Detailed Implementation

[0021] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. Furthermore, spatial relationship terms such as "upper," "lower," "front," "rear," "left," and "right" are used for descriptive convenience to explain the positional relationship between two components.

[0022] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0023] like Figure 1 As shown, this application provides a high-pressure anti-flutter check valve, including: a housing 10, a valve seat 20, a valve core skeleton 30, a valve core spring 40, and a damping pad 50.

[0024] The housing 10 is the main pressure-bearing component of the one-way valve. Its right end has a left-concave receiving cavity, and its left end has an air intake passage extending into the receiving cavity. The valve core frame 30 has a right-concave damping cavity at its left end, into which a damping pad 50 is installed. The valve core frame 30 has a left-concave main spring cavity at its right end, into which a valve core spring 40 is installed. The valve core frame 30 is inserted into the receiving cavity of the housing 10. The left end face of the valve core frame 30 contacts the inner end face of the receiving cavity, and the left end face of the damping pad 50 contacts and presses against the inner end face of the receiving cavity. The outer peripheral surface of the right section of the valve core frame 30 contacts the inner surface of the receiving cavity. The outer peripheral surface of the left section of the valve core skeleton 30 is spaced from the inner surface of the receiving cavity, and the outer peripheral surface of the left section of the valve core skeleton 30 has a valve core air hole that extends to the merging cavity. The merging cavity is located inside the valve core skeleton 30 and its right end is connected to the left end of the main spring cavity. The left end of the valve seat 20 has a right-recessed mounting cavity, and the right end of the valve body 20 has an air outlet passage that extends to the mounting cavity. The right section of the housing 10 is inserted into and fixed to the mounting cavity of the valve seat 20, and the right end face of the valve core spring 40 contacts and presses against the inner end face of the mounting cavity to ensure the initial sealing of the valve core skeleton 30 and the reset of the valve core skeleton 30 after opening.

[0025] During operation, gas enters through the inlet of the intake channel. Figure 1The direction indicated by the middle arrow A is the direction of gas flow. The gas exerts a force on the left end of the valve core frame 30, pushing the valve core frame 30 to move to the right against the damping force of the damping pad 50, the elastic force of the valve core spring 40, and the gas pressure at the outlet of the gas outlet channel. The one-way valve opens, thus creating a certain distance between the left end face of the valve core frame 30 and the inner end face of the receiving cavity. The gas enters the space between the inner side of the receiving cavity and the outer peripheral surface of the left section of the valve core frame 30. Then, the gas enters the merging cavity through the valve core air hole, then enters the main spring cavity, and finally enters the pipeline through the outlet of the gas outlet channel. After the gas is released at the inlet of the gas inlet channel, the valve core frame 30 returns to its original position under the action of the elastic force of the valve core spring 40 and the gas pressure at the outlet of the gas outlet channel, overcoming the damping force of the damping pad 50. The one-way valve closes.

[0026] Because the high-pressure anti-chatter check valve in this application provides damping force to the valve core skeleton 30 through the damping pad 50 when the gas is released, the valve core skeleton 30 returns to its position smoothly, preventing the valve core skeleton 30 from chattering. In addition, this application avoids preventing chattering by adding a flow-limiting orifice, thus ensuring that the check valve is small in size when used in a high-pressure environment. It also avoids using a corrugated belt expansion ring to prevent chattering, thus making the installation of the check valve simpler and avoiding jamming.

[0027] Optionally, the outer diameter of the left section of the housing 10 is smaller than the outer diameter of the right section of the housing 10, and the outer diameter of the right section of the valve seat 20 is smaller than the outer diameter of the left section of the valve seat 20. The smaller outer diameters of the left section of the housing 10 and the right section of the valve seat 20 facilitate connection to pipelines, while the larger outer diameter of the right section of the housing 10 facilitates the accommodation of the valve core skeleton 30, and the larger outer diameter of the left section of the valve seat 20 facilitates the accommodation of the right section of the housing 10. Alternatively, the outer circumferential surface of the right section of the housing 10 has external threads, and the inner surface of the mounting cavity has internal threads, with the right section of the housing 10 threadedly fixed to the mounting cavity of the valve seat 20. Still alternatively, the inner end face of the mounting cavity of the valve seat 20 has a spring seat 21 protruding to the left, and the mounting seat 21 surrounds the air outlet passage. The right end of the valve core spring 40 is sleeved on the outside of the spring seat 21, thereby restricting the position of the valve core spring 40 and preventing changes in its position.

[0028] In addition, a sealing gasket 60 is provided between the right end face of the housing 10 and the inner end face of the mounting cavity, and the sealing gasket 60 is squeezed by the right end face of the housing 10 and the inner end face of the mounting cavity, thereby ensuring the sealing between the housing 10 and the valve seat 20.

[0029] Optionally, the sealing gasket 60 is a metal sealing ring. Alternatively, the right end face of the housing 10 near the outer ring is recessed to the left, and the right end face of the housing 10 near the inner ring is convex to the right; the inner end face of the mounting cavity near the outer ring is convex to the left, and the inner end face of the mounting cavity near the inner ring is recessed to the right; the right end face of the housing 10 with the convex portion to the right faces the right-recessed portion of the mounting cavity, and the right end face of the housing 10 with the recessed portion to the left faces the left-recessed portion of the mounting cavity, with the sealing gasket 60 pressed between the right end face of the housing 10 with the left-recessed portion and the inner end face of the mounting cavity with the left-recessed portion, thus achieving a more effective seal through this stepped fit.

[0030] In addition, a U-shaped spring 70 is provided between the outer peripheral surface of the right section of the valve core skeleton 30 and the inner surface of the receiving cavity, and the two spring arms of the U-shaped spring 70 are pressed between the outer peripheral surface of the right section of the valve core skeleton 30 and the inner surface of the receiving cavity, thereby ensuring the sealing between the outer peripheral surface of the right section of the valve core skeleton 30 and the inner surface of the receiving cavity through the U-shaped spring 70.

[0031] Optionally, the U-shaped spring 70 is annular, thus providing a seal at every circumferential position to ensure airtightness. Alternatively, the outer peripheral surface of the right segment of the valve core skeleton 30 near the left side has an inwardly recessed first valve core groove, and the inner surface of the receiving cavity corresponding to the first valve core groove has an outwardly recessed first housing groove. One spring arm of the first U-shaped spring is located within the first valve core groove, and the other spring arm of the first U-shaped spring is located within the first housing groove. Still optionally, the opening of the first U-shaped spring faces to the left. Again optionally, the outer peripheral surface of the right segment of the valve core skeleton 30 near the right side has an inwardly recessed second valve core groove, and the inner surface of the receiving cavity corresponding to the second valve core groove has an outwardly recessed second housing groove. One spring arm of the second U-shaped spring is located within the second valve core groove, and the other spring arm of the second U-shaped spring is located within the second housing groove. Alternatively, the opening of the second U-shaped spring faces to the right.

[0032] In addition, the outer peripheral surface of the left section of the valve core skeleton 30 has multiple evenly distributed valve core vents. Optionally, the outer peripheral surface of the left section of the valve core skeleton 30 has four evenly distributed valve core vents. Alternatively, the valve core vents gradually slope to the right from their inlet to their outlet, thereby making the gas flow generally from left to right.

[0033] Furthermore, the opening area of ​​the damping cavity is smaller than the internal area of ​​the damping cavity, thereby preventing the damping pad 50 from detaching from the damping cavity. Optionally, the cross-sectional shape of the damping cavity from left to right is trapezoidal, with its upper base on the left and its lower base on the right. Alternatively, the damping cavity extends in a circumferential direction, and the corresponding damping pad 50 is an annular damping pad, thus preventing chattering of the valve core frame 30 at every position on the circumference. Still alternatively, the annular damping pad uses a metal spring + non-metallic composite ring structure.

[0034] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0035] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-pressure anti-flutter check valve, characterized in that, include: Housing, valve seat, valve core skeleton, valve core spring and damping pad; The right end of the housing has a recessed cavity facing to the left, and the left end of the housing has an air intake channel that extends into the cavity. The left end of the valve core skeleton has a damping cavity that is recessed to the right and has a damping pad installed, and the right end of the valve core skeleton has a main spring cavity that is recessed to the left and has a valve core spring installed. The valve core skeleton is inserted into the receiving cavity. The left end face of the valve core skeleton contacts the inner end face of the receiving cavity. The left end face of the damping pad contacts and presses against the inner end face of the receiving cavity. The outer peripheral surface of the right section of the valve core skeleton contacts the inner side of the receiving cavity. There is a gap between the outer peripheral surface of the left section of the valve core skeleton and the inner side of the receiving cavity. The outer peripheral surface of the left section of the valve core skeleton has a valve core air hole that extends to the merging cavity. The right end of the merging cavity is connected to the left end of the main spring cavity. The left end of the valve seat has a right-recessed mounting cavity, the right end of the valve body has an air outlet passage that extends to the mounting cavity, the right section of the housing is inserted into and fixed to the mounting cavity of the valve seat, and the right end face of the valve core spring contacts and presses against the inner end face of the mounting cavity.

2. The high-pressure anti-flutter check valve according to claim 1, characterized in that, The outer circumferential surface of the right section of the housing has external threads, and the inner surface of the mounting cavity has internal threads. The right section of the housing is threadedly fixed to the mounting cavity of the valve seat.

3. The high-pressure anti-flutter check valve according to claim 1 or 2, characterized in that, The inner end face of the valve seat mounting cavity has a spring seat that protrudes to the left, and the mounting seat surrounds the air outlet passage. The right end of the valve core spring is sleeved on the outside of the spring seat.

4. The high-pressure anti-flutter check valve according to claim 1 or 2, characterized in that, A sealing gasket is provided between the right end face of the housing and the inner end face of the mounting cavity, and the sealing gasket is squeezed by the right end face of the housing and the inner end face of the mounting cavity.

5. The high-pressure anti-flutter check valve according to claim 4, characterized in that, The right end face of the shell is concave to the left near the outer ring, and the right end face of the shell is convex to the right near the inner ring. The inner end face of the mounting cavity protrudes to the left near the outer ring, and the inner end face of the mounting cavity is recessed to the right near the inner ring. The right end of the housing, which protrudes to the right, is opposite to the right-recessed part of the inner end of the mounting cavity, and the right end of the housing, which is recessed to the left, is opposite to the left-protruding part of the inner end of the mounting cavity. The sealing gasket is pressed between the right end of the housing, which is recessed to the left, and the inner end of the mounting cavity, which is protruding to the left.

6. The high-pressure anti-flutter check valve according to claim 1 or 2, characterized in that, A U-shaped spring is provided between the outer peripheral surface of the right section of the valve core skeleton and the inner surface of the receiving cavity, and the two spring arms of the U-shaped spring are pressed between the outer peripheral surface of the right section of the valve core skeleton and the inner surface of the receiving cavity.

7. The high-pressure anti-flutter check valve according to claim 6, characterized in that, The outer peripheral surface of the right section of the valve core skeleton near the left side has an inwardly recessed first valve core groove, and the inner side of the receiving cavity has an outwardly recessed first housing groove at the position corresponding to the first valve core groove. One spring arm of the first U-shaped spring is located in the first valve core groove, and the other spring arm of the first U-shaped spring is located in the first housing groove. The outer peripheral surface of the right section of the valve core skeleton has an inwardly recessed second valve core groove near the right side. The inner side of the receiving cavity has an outwardly recessed second housing groove at the position corresponding to the second valve core groove. One spring arm of the second U-shaped spring is located in the second valve core groove, and the other spring arm of the second U-shaped spring is located in the second housing groove.

8. The high-pressure anti-flutter check valve according to claim 7, characterized in that, The opening of the first U-shaped spring faces to the left, and the opening of the second U-shaped spring faces to the right.

9. The high-pressure anti-flutter check valve according to claim 1 or 2, characterized in that, The outer circumferential surface of the left section of the valve core skeleton has multiple valve core vents, and all valve core vents are evenly distributed.

10. The high-pressure anti-flutter check valve according to claim 9, characterized in that, The valve core vent gradually tilts to the right from its inlet to its outlet.

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